We aver



2 shet 1' (No Model.)

- J N WEAVER Crown-Sheet Attachment.-

' Patented May 4, I880.

INVENTOR QA M %w1 ATTORNEYS (No Model.)

JKN. WEAVER. Grown-Sheet Attachment.

2 Sheets-Sheet 2.

Patented May 4, I880:

- WITNESSES ATTORNEYS NPEIERS, PHOTO LITHOGRAPH ASH NGTON D C UNITESTATES PATENT QFFICEO JAMES N. WEAVER, oE wAvERLY, NEW YORK.

CROWN-SHEET ATTACHMENT.

SPECIFICATION forming part of Letters Patent No. 227,336, dated May 4,1880.

Application filed March 13, 1880. (No model.)

To all whom it may concern Be it known that 1, JAMES N. WEAVER, ofWaverly, in the county of Tioga and State of New York, have inventedcertain new and useful Improvements in Grown-SheetAttachments forSteam-Boilers; and I do hereby declare the following to be a full,clear, and exact description of the invention, such as will enableothers skilled in the art to which it appertains to make and use thesame, reference being had to the accompanying drawings, and to lettersof reference marked thereon, which form a part of this specification.

My invention relates to an improvement in crown-sheet attachments forsteam-boilers. I

Heretofore the crown-bars have been secured to crown-sheets in thefollowing manner: The crown-bolts are formed with a beveled portionunder the bolt-head by turning the bevel on a lathe and reaming out theholes in the crownsheet, forming a beveled bolt-hole corresponding tothe beveled portion on the bolts, and the bolts are then inserted inplace and drawn iron to iron by means of the nuts on top of thecrown-bars.

This construction is objectionable for the following reasons: First, byreason of the undue cost of preparing the crown-sheet and crown-bolts,as costly machinery, labor, and considerable time are required in theturning and reaming processes hereinbefore described; second, thecrown-sheets are often slightly warped or sprung, owing to a slightunevenness of the cast-iron ferrules interposed between the crown-sheetand crown-bars,and hence a steam-tight joint, although formed when thebolts are first tightened, will become impaired after a comparativelyshort time, as the water will enter the upper side of the joint andoperate to corrode and destroy the narrow seat forming the joint.

The object of my invention is to obviate the defects and objectionablefeatures hereinbefore set forth, and to form a perfectly-tight jointbetween the crown-bolts and crown-sheet without turning the bevel on thecrown-bolts, and construct the devices at small initial cost, and insure the most perfect and satisfactory results; and to this end myinvention consists,

essentially, in the combination, with the crownsheet and crown-bolts,the latter formed with a bevel under thebolt-heads, of tapering copperferrules interposed between the bolt-holes in the crown-sheet andbeveled portions of the crown-bolts.

My invention further consists in a taperedcopper ferrule formed withopen ends .and adapted to be applied to the beveled portions ofcrown-sheet bolts.

My invention further consists in certain other details in constructionand combination of parts, as will hereinafter be described, and pointedout in the claims.

In the accompanying drawings, Figure l is a transverse section takenthrough a portion of a crown-sheet, showing a section of the crown-barsand crown-bolts in side elevation. Fig. 2 is a transverse section takenthrough a portion of the crown-sheet, ferrule, and crownsheet bolts.Fig. 3 is a view, in perspective, of one of the crown sheet bolts. Fig.LlS a similar view of one of the tapered copper ferrules.

Fig. 5 is a similar View, illustrating the copper ferrule applied to thebolt. Figs. 6, 7, 8, and 9 are views, in side elevations, of the punchesand dies for making my improved crown-bolt ferrules.

A represents the crown-sheet of a boiler. 13 are the bolt-holes, madeslightly tapering from the under to the upper side of the crownsheet. 0are the crown-bolts, each being provided with a beveled portion, a,under the bolt-head Z). Grown-bolts O are forged in a steel die toform'the bevel portion a.

As a very slight irregularity in the shape of the bevel portion of thecrown-bolts as ordinarily used would be fatally defective to theirefficiency, it is absolutely necessary to turn the bevel portion a in alathe, as hereinbefore explained, in order to insure a perfectly trueand even surface to the beveled portion a of the bolt; but in myinvention it is not requisite that the bevel portion shall be formedwith such nicety and precision, and hence I am enabled to dispense withthe lathe-turning and form the bolt in a steel die. This part of theoperation results in a material saving in expense, as the employment ofcostly labor and machinery and much valuable time is thereby avoided.

D represents the crown-bars, which latter are arranged in pairs in theusual manner, and

secured together by bolts or rivets 0. Around the crown-bolts 0, betweenthe crown-sheet and crown-bars, are interposed the cast-iron ferrules.Flanged bolt-plates E are placed upon the upper edges of the crown-bars,the flanges e of the plates overlapping the edges of the two adjacentcrown-bars, and thereby preventing the latter from spreading. Thethreaded ends of the crown-bolts extend upwardly through holes in theplates E, and are secured by the nuts F.

Around the beveled portion a of the crownbolt is placed a copperferrule, G, which is tapered to fit the beveled portion a of the boltand the beveled bolt-hole in the crown-sheet.

When the nuts F are drawn up tight the copper ferrulesaccommodatethemselves to an yinequalities or irregularities in the surfaces ofeither the bolt or the bolt-holes, and form a perfectly steam-tightjoint, and protect the iron from corrosion.

When it becomes necessar Y to remove the crown-bars to cleanse them ofscale-a n operation which is often required, especially when impurewater is used in the boilerit is only necessary to fresh up or recut thethreads of the crown-bolts, slip one of the ferrules on each bolt, andtighten the nuts, thereby drawing the copper ferrule in tight andintimate contact with the bolt and bolt -hole in the crown-sheet, andthus insure a perfect joint though the bolt-hole in the crown-sheet maybe rough and irregular as the copper is sufficient] y ductile to adaptitself to any such irregularities of surface.

The copper ferrules are made by first cutting a round disk of copper outof No. 20 sheet copper by the employment of the punch H, in connectionwith the die I, the latter being provided with a guide, I, to guide andcenter the punch. The disk of copper is then operated upon by the punchK, which draws the disk into cup shape, which latter is then subjectedto the action of punch L, which joint.

I make no claim to the dies and punches for manufacturing the copperferrules, but describe the method and means employed in theirmanufacture, so that upon the expiration of this patent the public mayhave full knowledge of the method and means necessary to be employed toenjoy the invention hereinafter claimed.

Having fully described my invention, what I claim as new, and desire tosecure by Let ters Patent, is

1. The combination, with a crown-sheet provided with beveled bolt-holesand crownbolts, each having a beveled portion under the bolt-head, oftapering copper ferrule interposed between the bolt and crown-sheet, toform a steam-tight joint, substantially as set forth.

2. The combination, with a crown-sheet provided with beveled bolt-holesand crownbolts, each having a ber eled portion formed under thebolt-head by forging, of tapering copper ferrules surrounding thebeveled portion of the crown-bolts and forming a steamtight joint withthe crown-sheet, substantially as set forth.

3. A tapered copper ferrule adapted to be applied to the beveled portionof a crownsheet bolt, substantially as set forth.

In testimony that I claim the foregoing I have hereunto set my hand andseal this 8th day of March, 1880.

JAMES N. WEAVER.

Witnesses: 4

E. J. CAMPBELL, J AMES R. STONE.

